| abstract |
The present invention provides a security element which is low inncost, is difficult to forge or alter, and can be applied to objects where anhigh level of security is required. The security element comprises atnleast a substrate and a fluorescent colorant layer provided on thensubstrate, wherein the fluorescent colorant layer comprises N species ofnfluorescent colorants F n , wherein N is an integer of 2 or more and n is anninteger of not less than one and not more than N, in the same layer, andnthe fluorescent colorant F n absorbs light with a wavelength of λ n andnemits fluorescence with a wavelength of λ n+1 . |